Contradiction with James 1:27
James emphasizes external actions in pure religion, whereas Matthew 6:18 highlights inward, invisible devotion.
James 1:27: Pure religion and undefiled before God and the Father is this, To visit the fatherless and widows in their affliction, [and] to keep himself unspotted from the world.
Contradiction with Matthew 5:16
Encourages letting others see good deeds, contrasting with Matthew 6:18's focus on secrecy.
Matthew 5:16: Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven.
Contradiction with 1 Peter 2:12
Suggests maintaining an outward testimony to influence others, in contrast to the quiet practice in Matthew 6:18.
1 Peter 2:12: Having your conversation honest among the Gentiles: that, whereas they speak against you as evildoers, they may by [your] good works, which they shall behold, glorify God in the day of visitation. [whereas: or, wherein]
Contradiction with 1 Corinthians 10:31
Calls for all actions to be done for God's glory openly, contradicting the hidden practice in Matthew 6:18.
1 Corinthians 10:31: Whether therefore ye eat, or drink, or whatsoever ye do, do all to the glory of God.